Thermodynamic study of metal corrosion and inhibitor adsorption processes in copper/ N-1-naphthylethylenediamine dihydrochloride monomethanolate/nitric acid system: part 2 A. Zarrouk • B. Hammouti • H. Zarrok • S. S. Al-Deyab • I. Warad Received: 17 November 2011 / Accepted: 17 January 2012 / Published online: 1 February 2012 Ó Springer Science+Business Media B.V. 2012 Abstract N-1-Naphthylethylenediamine dihydrochloride monomethanolate (N-NEDHME) was tested as a corrosion inhibitor for copper in 2 M HNO 3 solution using the standard gravimetric technique at 303–343 K. N-NEDHME acts as an inhibitor for copper in an acidic medium. Inhibition efficiency increases with increase in concentration of N-NEDHME but decreases with a rise in temperature. Thermodynamic parameters such as adsorption heat (DH  ads ), adsorption entropy (DS  ads ) and adsorption free energy (DG  ads ) were obtained from experimental data of the temperature studies of the inhibition process at five temperatures ranging from 303 to 343 K. Kinetic parameters activation such as E a , DH  a , DS  a and pre- exponential factors have been calculated and are discussed. Adsorption of N-NEDHME on the copper surface in 2 M HNO 3 follows the Langmuir isotherm model. Keywords Copper  Corrosion  Thermodynamic  Inhibitor  Adsorption  Nitric acid A. Zarrouk (&)  B. Hammouti LCAE-URAC18, Faculte ´ des Sciences, Universite ´ Mohammed Ier, B.P. 717, 60000 Oujda, Morocco e-mail: azarrouk@gmail.com H. Zarrok Laboratoire des proce `des de se ´paration, Faculte ´ des Sciences, Universite ´ Ibn Tofail, B.P. 242, 14000 Kenitra, Morocco S. S. Al-Deyab  I. Warad Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia 123 Res Chem Intermed (2012) 38:1655–1668 DOI 10.1007/s11164-012-0492-2